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Financing (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Outstanding financing facilities
 
March 31, 2018
 
December 31, 2017
Revolving Credit Facility, weighted-average variable interest rate of 2.784%
$
560,000

 
$
346,000

$500 million, 4.875% Senior Notes due 2021(1), effective interest rate of 4.955%
497,766

 
497,565

$300 million, 4.625% Senior Notes due 2021(2), effective interest rate of 4.645%
299,032

 
298,961

$300 million, 3.800% Senior Notes due 2022(3), effective interest rate of 3.845%
298,303

 
298,214

$300 million, 3.850% Senior Notes due 2023(4), effective interest rate of 3.851%
298,642

 
298,583

$500 million, 3.550% Senior Notes due 2026(5), effective interest rate of 3.570%
495,902

 
495,792

$750 million, 3.600% Senior Notes due 2027(6), effective interest rate of 3.619%
743,421

 
743,275

Long-term debt
$
3,193,066

 
$
2,978,390

(1) 
Net of unamortized discount of $1.0 million as of March 31, 2018, and $1.1 million as of December 31, 2017, and debt issuance costs of $1.3 million as of March 31, 2018, and $1.4 million as of December 31, 2017.
(2) 
Net of unamortized discount of $0.2 million as of March 31, 2018, and December 31, 2017, and debt issuance costs of $0.8 million as of March 31, 2018, and December 31, 2017.
(3) 
Net of unamortized discount of $0.5 million as of March 31, 2018, and $0.6 million as of December 31, 2017, and debt issuance costs of $1.2 million as of March 31, 2018, and December 31, 2017.
(4) 
Net of unamortized discount of less than $0.1 million as of March 31, 2018, and December 31, 2017, and debt issuance costs of $1.3 million as of March 31, 2018, and $1.4 million as of December 31, 2017.
(5) 
Net of unamortized discount of $0.7 million as of March 31, 2018, and December 31, 2017, and debt issuance costs of $3.4 million as of March 31, 2018, and $3.5 million as of December 31, 2017.
(6) 
Net of unamortized discount of $1.1 million as of March 31, 2018, and $1.2 million as of December 31, 2017, and debt issuance costs of $5.4 million as of March 31, 2018 and $5.6 million as of December 31, 2017.